Socket for incandescent lamps.



0. KUPFERIVIAN.

SOCKET F-OR INCANDESCENT LAMPS.

APPLICATION FILED. APR. s, 19u.

Patented Apr. 22, 1919.

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Specication of Letters Patent. lllattcentd Api. 252, lliilllg ,application filed April 8, 1917. Serial Ito. 60,303.

To all 'whom t may concern:

Be it known that l, OSCAR KUrrnRMAn, a citizen oit' the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements 1n Sockets for incandescent Lamps, of which the following is a specification..

The present invention refers to improvements in sockets for incandescent lamps and has for this object to simplify the construction of a key-actuated socket, adapted to operate for making and breaking the current, so that all cooperating parts can be readily and quickly assembled and are easily accessible orrepair.

There is a general drawback attached to the hitherto-known sockets which resides in the attachment of the hood orl cover oi the shell containing the insulating bjase and make and break switchn in all hitherto used sockets, the two parts, namely, the shell or casing and the cover can be disconnected only with great diculty, requiring a strong pressure on the shell or a downward pull, which frequently causes damage to the device itself and also to the chandelier.

, Others, on the other hand, have a construction which at a slight jerk, will cause the disconnection ofthe two parts. l',lhis invention has, therefore, another object, namely, to obviate the above named drawbacks and to provide a construction, whereby the connection and disconnection of the shell and cover or hood can be edected in the simplest and quickest way, and whereby an accidental disengagement of the parts will be rendered impossible.

With these and other objects in view, my invention consists in the construction, combination and arrangement of parts as will be hereinafter fully described and set forth in the appended claim.

lin the drawing, which forms part of this specification and in which similar reference characters denote corresponding parts, Figvure l is an elevation of my new socket, with some parts broken away to show details of construction; and Fig. 2 is a vertical section of the shell, showing the switch in a iront elevation.

Referring specically to the drawing, 20 denotes the hood which is ada ted to lit over the top opening of the shel or casing 21 containing the insulating base i. lin order to secure the hood 20 to the shell 2l, but

at the same time allow the easy removal thereof for purposes of repair, inspection or the like, .l provide the following construction:

Illhe shell 21 at its upper end is provided with a number of angular incisions or slots 2l substantially of the form shown. The cover or hood 20 which is of the usual shape is provided with a hollow sleeve-shaped projection 20 which extends from the top of the cover into the latter. rlhis sleeve 20 serves as a bearing for a spiral spring 22, which is mounted around said sleeve 2.0 and has one oi its ends fixed to the top of the cover 20. rl`he spring is of such a length that when the cover 20 is applied to the shell 2l, its lower or free end will tend to project into the casing or shell 21.- Projecting from the inner circumference of the cover 20, are pins 23 or other suitable members, which in number correspond with the number of slots 2l and which are adapted when the cover is applied to engage the said slots` and upon turning the cover slightly around its vertical axis to enter the vertical parts 212 thereof and to thereby retain the cover in position. 'llhe spring 22 by reason of its expansion tendency will insure engagement of the pins 23 with the parts 212 of the slots 21 and prevent accidental disengagement or disconnection oi the cover and shell. Loosely placed against the free end oi' the spring 22 is a disk 24: of suitable insulating material and of a diameter substantially equal to the inner diameter of the cylindrica"l bottom part 202 of the cover 20. rlFhis disk normally, e". e. when the cover is removed from the shell will rest on the pins 23, a pressure being. exerted thereon by the spring 22. But when the cover 20 is applied to the shell 21, the disk 24 will be engaged by the upper edge of the shell 2'1l and will -be raised against the tension oi the spring 22, thereby compressing the latter. 'lhe reaction o the spring will be a force on the pins 23 insuring their engagement in parts 21? of the slots 2l.

The insulating base l when positioned in the casing or shell 2l will have its upper :tace about even with the upper edge of the shell. ln consequence thereof, it will be clear, the screwing in of the incandescent lamp into the screw shell 11 of the insulating base, will have the eect to still more tighten the cover to the shell because oi the reaction oi the compressed spring 22o in order to remove the cover, it will be necessary to rst press the shell upwardly against the tension of the spring and then give 1t or the cover a short turn so as to cause the pins to enter the open part of the slots through which they can escape.

lt is understood that various modifications may be made in tile construction of thedevice without departing from the prmciple of my invention and l therefore do not wish to restrict myself to the details shown and described.

What li claim and desire to secure by Letters Patent, is:

lin a lamp socket, a shell having angular recesses at its upper end, a cover to iit around the upper end of said shell and having projections adapted to engage.. the said recesses and form therewith a bayonet joint, a spiral spring in said cover of which one merece end is iixed to the latter and the tree end of which has tbe tendency to project into the shell, a comparatively thin disk of insulating material loosely mounted in said cover and adapted normally to rest on the said projections of the latter and to be acted upon by said spring, but upon assembling the said shell and cover to lbe engaged by the said shell and moved against the tendency of the said spring Wherebytlie said shell and cover when connected by the bayonet joint become firmly locked with each other.

Signed at New York, in the county loi' New York and State of New York .this 5th day of April A. D. 1917.

@SCAR KUPFERll/AN.

Witnesses:

MAX D. ORDMANN, A. M. WATTENBERG. 

